While this looks like a dead topic, I just came across it...and...my uncle had been exxed and a number of years later he passed away in an plane crash. My grandparents petitioned the Frist Presidency, through their Stake President, and was told that they would pray on the matter and inform my grandparents when they felt confident it was time for my uncle to be rebaptized and his temple blessings restored (both via a general authority as proxy). About 1 year later they received notice that my uncle's work had been completed and, in the eyes of the church, it was as if he had never been excommunicated.
